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Screen goes black when alt+tabbing...

I reinstalled my OS a few days ago and everything is running fine, except that when I alt+tab out of the game (and only DURING the game, this doesn't happen during champion select or any other time) and tab back in, the screen is black for 20-30 seconds. It does always come back up, it's just that the delay is really long. So, is there any way to fix this? And note, this never happened before, only after I reinstalled Windows. Thanks.